Greater Integers

input/code.cpp: In function 'int main()':
input/code.cpp:34:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int j = 0; j < s.size() && f; ++j){
                            ~~^~~~~~~~~~
input/code.cpp:41:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j = 0; j < s.size(); ++j)
                                ~~^~~~~~~~~~

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize ("O3")
//#pragma GCC optimize ("Ofast")
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize ("trapv")
//#pragma GCC optimize ("sse, ssse, sse2, avx")

#define f first
#define s second
#define pb push_back
#define ld long double
#define int long long

using namespace std;

const int N = 2e5 + 10, mod = 1e9 + 7, inf = 1e18 + 10;

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int t; cin >> t;
    while(t--){
        int n; cin >> n;
        ++n;
        string s;
        while(n)
            s = (char)(n % 10 + '0') + s, n /= 10;
        for(int i = 1; i <= 9; ++i){
            bool f = true, was = false;
            for(int j = 0; j < s.size() && f; ++j){
                if(s[j] - '0' < i)
                    was = true;
                if(!(was || s[j] - '0' <= i))
                    f = false;
            }
            if(f){
                for(int j = 0; j < s.size(); ++j)
                    cout << i;
                cout << "\n";
                break;
            }
        }
    }
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED